Ring binder mechanism fastener



FIG. 1 is a top perspective view of a ring binder mechanism fastener showing my new design, the broken line showing of the ring binder mechanism is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is an enlarged top perspective of one of the fasteners;

FIG. 3 is a bottom perspective view of thereof;

FIG. 4 is a front elevational view of the thereof, the rear elevational view being identical;

FIG. 5 is a left side elevational view thereof, the right side elevational view being identical;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top perspective view of a ring binder mechanism fastener of a second embodiment;

FIG. 9 is a bottom perspective view thereof; and,

FIG. 10 is a top plan view thereof. 

The ornamental design for a ring binder mechanism fastener, as shown and described. 